Noritz N-0841MC Manuel utilisateur
N‐0841MC,N‐0842MC,NRC111andNCC199Series
HeatExchangerReplacement
ModelsInclude:N‐0841MC,N‐0841MC‐DV
N‐0842MC,N‐0842MC‐DV
NRC111‐SV,NRC111‐DV
NCC199‐SV,NCC199‐DV
ThisinstructionalmanualisonlyintendedforusebyaqualifiedserviceprofessionalorauthorizedNoritz
ServiceRepresentative.Anyunauthorizeduseofthismanualmayresultinvoidingthewarranty.
PleasecontactNoritzTechnicalSupport(866‐766‐7489)foradditionalsupport.
NoritzAmericaCorporation
11160GraceAvenue,FountainValley,CA92708
Phone866‐766‐7489Fax714‐241‐1196
Page 1
NRC111andNCC199(N‐0841MC,N0842MCSeries)HeatExchangerReplacementProcedure
ProcedureDiagram
1. Removefrontcover
(1) Disconnectelectricalpowertounit
(2) Remove4screws
(3) Turnoffgasandwater
(4) Removefilteranddrainunit
completely
(5) Opendrainportsonthebottomofthe
unit
2. RemoveGFCIandcircuitboard
(1) RemovetwoscrewsthatholdtheGFCI
Plate,onescrewwillhaveaground
wireattached),LetGFCIhangoutside
oftheunit
(2) Removethegroundwirethatistothe
leftofthecircuitboard
(3) Loosenwireanchorfromrightsideof
case
(4) Removethecircuitboard;thereare
twoscrews,oneontopandbottomof
thecircuitboard.Letthecircuitboard
hangoutsideoftheunit
Page 2
ProcedureDiagram
3. Removegasvalveassembly
(1) Locate“C”clamponthebottomright
handcorneroftheunitthatattaches
thegasconnectiontothemanifold
plateandremove.
(2) Locateinletgaspipetomanifoldand
pushup.
(3) Locatethelargewiringconnection,
thatattachesthewiresfromthe
manifoldplatetothewiringharness,
anddisconnecttheplug.
(4) Nextlocatethefourbigsilverscrews
holdingthemanifoldplatetothe
burner,therewillbetwoontheright
andleftsideofthemanifoldplate.
Removethosefourscrewsandthe
manifoldplateandpipecanbe
removedandsetaside.
4. Unplugallwiresthatattachtothewiring
harnessandthebodyofthewaterheater
(1) Wiringforthefan
Page 3
ProcedureDiagram
(2) LeftSideWiringHarness:Thermalfuse
(2),Freezepreventionheaters(2),
Neutralizersensorplug
(3) RightSideWiringHarness:Highlimit
switch(2),Freezeprevention
heater(2),Freezepreventionsensor
(4) Flamerods(2),ignitionbox
(5) LeftSideOnStainlessSteelHeat
Exchanger(akaSSHE):Freeze
preventionsensor(takeoffwholeclip)
(6) RightSideOnSSHE:Freezeprevention
sensorplugs(2)
Page 4
ProcedureDiagram
5. RemovingtheNeutralizer
(1) Removethescrewholdingthemetal
clamponthetopofneutralizer
(2) Removethe3springclampsonthe
hosesoftheneutralizer.1willberight
belowtheSSHEand2willbeonthe
neutralizer(youwillneedaneedle
noseplierstoopenspringclamps)
(3) Pullhosesoffwhereclampswere
removed
(4) Liftuponneutralizerandpulloutand
setaside
6. RemoveWaterPipesInsideUnit
(1) Remove“C”Clampontopoffoam
coveredpipegoingintoSSHE
(2) Remove“C”Clamponbottomof
foamcoveredpipegoingintoFlow
Sensor
(3) RemovePipeandsetaside
Page 5
ProcedureDiagram
(4) Locate¼”drainpipeonrighthandside
ofunitanddisconnectbothsmall“C”
Clampsontopandbottomofpipe
(5) DisconnectFreezepreventionheater
on¼”drainpipe
(6) Remove¼”DrainPipeandsetaside
(7) LeftSide:Disconnect“C”Clampfrom
CopperHeatExchanger(akaCUHE)
andMainWaterControlValve
(8) Pulloutpipe
7. RemoveFluefromTopofUnit
(1) Disconnecttheventingfromtheunit
(2) Removethe4screwsandpulltheFlue
offoftheunitandsetaside
Page 6
ProcedureDiagram
8. Removeheatexchangerfromcase
(1) Removethe2setscrewsonthe
bottomoftheburner
(2) Removetheupperleftandrightset
screwsnearthetopcenterofthecase
(supportbottomofassembly)
(3) SSHE,CUHE,Burner,andFanwill
comeoutinonesection.Remove
fromunit.
9. SeparatetheSSHEfromCUHE
(1) Removethe2screwonthebracket
betweentheSSHEandCUHE
(2) FliptheAssemblyoverandlocatethe
foamcoveredpipeconnectingthetwo
heatexchangers
Page 7
ProcedureDiagram
(3) Removethe2“C”Clampsonthe
endofeachpipeandremovepipe
andsetaside
(4) Removethe9screwsthatlocated
onthebacksideoftheSSHE
(5) SeparatetheSSHEfromtheCUHE
10. ReplacingStainlessSteelHeat
Exchanger
Note:IfyouarenotreplacingtheSSHE
thenyoucanskipthisstepandsetSSHE
side.
shippedintheheatexchanger
theSSHEand
LimitSwitchandplaceonnewSSHE
a
(1) CheckthegasketontheCUHE,ifit
isdamagedreplaceitwithonethat
was
kit
(2) Removethe2FreezePrevention
Heateronthefrontof
placeonnewSSHE
(3) OnRightSideofSSHE,remove
FreezePreventionSensorandHigh
Page 8
ProcedureDiagram
11. ReplacingtheCopperHeatExchanger
(1) Remove12screwsholdingburner
toheatexchanger
(2) SeparateburnerfromCUHE
12. Removeheatexchangercomponents
andputonnewheatexchanger
(1) LeftSide:FreezePreventionHeater
(2) RightSide:HighLimitSwitch
(3) Thermalfuseandfastenersfrom
foursidesofheatexchanger
LEFTSIDE
BACK
RIGHTSIDE
FRONT
Page 9
ProcedureDiagram
13. Replacegaskets
(1) Removeoldburnergasketand
replacewithnewone
(2) InspectgasketbetweenSSHEand
CUHEExhaustBox,ifthegasketis
damaged,replaceit.
14. PlacenewO‐RingsonnewCUHEand
PipebetweenCUHEandSSHE
(1) InlettoCUHE
(2) ExittoCUHE
(3) FoamPipethatconnectsSSHEand
CUHE
Page 10
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